Overrides \Drupal\views\Plugin\views\SqlBase::buildOptionsForm().
Overrides SqlBase::buildOptionsForm
public function buildOptionsForm(&$form, &$form_state) {
parent::buildOptionsForm($form, $form_state);
$form['quantity'] = array(
'#type' => 'number',
'#title' => t('Number of pager links visible'),
'#description' => t('Specify the number of links to pages to display in the pager.'),
'#default_value' => $this->options['quantity'],
);
$form['tags']['first'] = array(
'#type' => 'textfield',
'#title' => t('First page link text'),
'#default_value' => $this->options['tags']['first'],
'#weight' => -10,
);
$form['tags']['last'] = array(
'#type' => 'textfield',
'#title' => t('Last page link text'),
'#default_value' => $this->options['tags']['last'],
'#weight' => 10,
);
}